(3а-7)+(4-а)

To simplify the expression \((3a - 7) + (4 - a)\), you can combine like terms.

1. First, distribute or rewrite the expression: \[ 3a - 7 + 4 - a \]

2. Next, combine the \(a\) terms: \[ 3a - a = 2a \]

3. Now, combine the constant terms: \[ -7 + 4 = -3 \]

4. Putting it all together, you get: \[ 2a - 3 \]

So, the simplified expression is \(2a - 3\).